Antenna



FIG. 1 is a front elevation view of an antenna showing my new design;

FIG. 2 is a front, right perspective view thereof;

FIG. 3 is a front, bottom perspective view thereof;

FIG. 4 is a right side view thereof; the left side being a mirror image thereof; and,

FIG. 5 is a top plan view thereof, the bottom plan view being a mirror image thereof. 

CLAIM The ornamental design for an antenna, as shown and described. 